The purpose of providing an iron core in a transformer is to
a) Provide support to windings
b) Reduce hysteresis loss
c) Decrease the reluctance of the magnetic path
d) Reduce eddy current losses

Which of the following is not a part of transformer installation?
a) Conservator
b) Breather
c) Buchholz relay
d) Exciter

While conducting short-circuit test on a transformer the following side is short circuited,
a) High voltage side
b) Low voltage side
c) Primary side
d) Secondary side

Which winding in a transformer has more number of turns?
a) Low voltage winding
b) High voltage winding
c) Primary winding
d) Secondary winding

Efficiency of a power transformer is of the order of___.
a) 100 per cent
b) 98 per cent
c) 50 per cent
d) 25 per cent

A common method of cooling a power transformer is___
a) Natural air cooling
b) Air blast cooling
c) Oil cooling
d) None of these

In the transformer the function of a conservator is to__.
a) Provide fresh air for cooling the transformer
b) Supply cooling oil to transformer in time of need
c) Protect the transformer from damage when oil expends due to heating
d) None of the above

No-load current of a transformer has_
a) Has high magnitude and low power factor
b) Has high magnitude and high power factor
c) Has small magnitude and high power factor
d) Has small magnitude and low power factor

The power transformer is a constant_.
a) Voltage device
b) Current device
c) Power device
d) Main flux device

Two transformers operating in parallel will share the load depending upon their
a) Leakage reactance
b) Per unit impedance
c) Efficiencies
d) Ratings

In a transformer the tappings are generally provided on
a) Primary side
b) Secondary side
c) Low voltage side
d) High voltage side

The chemical used in breather for transformer should have the quality of _
a) Ionizing air
b) Absorbing moisture
c) Cleansing the transformer oil d) Cooling the transformer oil

The function of conservator in a transformer is_.
a) To project against'internal fault
b) To reduce copper as well as core losses
c) To cool the transformer oil
d) To take care of the expansion and contraction of transformer oil due to variation of
temperature of surroundings

Which of the following is the main advantage of an auto-transformer over a two winding
transformer?
a) Hysteresis losses are reduced b) Saving in winding material
c) Copper losses are negligible
d) Eddy losses are totally eliminated

Two transformers are connected in parallel. These transformers do not have equal
percentage impedance. This is likely to result in___.
a) Short-circuiting of the secondaries
b) Power factor of one of the transformers is leading while that of the other lagging
c) Transformers having higher copper losses will have negligible core losses
d) Loading of the transformers not in proportion to their kVA ratings